Hierarchical microstructure strengthening in a single crystal high entropy superalloy

A hierarchical microstructure strengthened high entropy superalloy (HESA) with superior cost specific yield strength from room temperature up to 1,023 K is presented. By phase transformation pathway through metastability, HESA possesses a hierarchical microstructure containing a dispersion of nano s...

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Detalles Bibliográficos
Autores principales: Chen, Yung-Ta, Chang, Yao-Jen, Murakami, Hideyuki, Sasaki, Taisuke, Hono, Kazuhiro, Li, Chen-Wei, Kakehi, Koji, Yeh, Jien-Wei, Yeh, An-Chou
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7376180/
https://www.ncbi.nlm.nih.gov/pubmed/32699329
http://dx.doi.org/10.1038/s41598-020-69257-8
Descripción
Sumario:A hierarchical microstructure strengthened high entropy superalloy (HESA) with superior cost specific yield strength from room temperature up to 1,023 K is presented. By phase transformation pathway through metastability, HESA possesses a hierarchical microstructure containing a dispersion of nano size disordered FCC particles inside ordered L1(2) precipitates that are within the FCC matrix. The average tensile yield strength of HESA from room temperature to 1,023 K could be 120 MPa higher than that of advanced single crystal superalloy, while HESA could still exhibit an elongation greater than 20%. Furthermore, the cost specific yield strength of HESA can be 8 times that of some superalloys. A template for lighter, stronger, cheaper, and more ductile high temperature alloy is proposed.

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